Revert "Adding flag com.android.server.display.feature.flags.subscribe_granular_display_events to trunk_staging."

This reverts commit ac63f18c8403186dcaacdb8ff798f1820ab6d529.

Reason for revert: <Potential culprit for b/381730834  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.>

Change-Id: If12eab61f03dbbe2d9df93c4d281047fbe8fc926